//
//  Atom.h
//  lzl-4-7
//
//  Created by 刘振霖 on 16/4/7.
//  Copyright © 2016年 刘振霖. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Atom : NSObject
@property (readonly) NSUInteger protons;
@property (readonly) NSUInteger neutrons;
@property (readonly) NSUInteger electrons;
@property (readonly) NSString * chemicalElement;


-(NSUInteger) massNumber;


@end
